Philipp goldmann



N0. 6l5,|58. Patented Nov. 29, I898. P. GOLDMANN.

CRANK MOTION.

(Application filed Oct. 1 1897.)

(No Model.)

1 21717,? GoZa'mann.

ATTORNEYS UNITED STATES PATENT OFFICE.

PHILIPP GOLDMANN, on NEW YORK, N. Y.

CRANK-MOTION.

SPECIFICATION forming part of Letters Patent No. 615,158, dated November 29, 1898.

Application filed October 1, 1897- To all whom it may concern.-

Be it known that I, PHILIPP GOLDMANN, a citizen of the United States, residing at New York, in the county and State of New York, have invented new and useful Improvements in Crank-Motions, of which the following is a specification.

By means of this invention a pedal can be maintained on a crank in position to convenient-ly accommodate the foot; and the invention resides in the novel features of construction set forth in the following specification and claims and illustrated in the annexed drawings, in which- Figure 1 is a side elevation of a bicycle with the crank-motion. Fig. 2 is a view like Fig. 1 with parts in a difierent position than in Fig. 1. Fig. 3 is a section along 00 50, Fig. 1. Fig. 4 is a section along yy, Fig. 2. Fig. 5 shows a modification.

A bicycle-frame or part of such frame is shown at 1 2 3 4. The driving-wheel is shown at 5 and has a sprocket-pulley connecting by chain 7 with pulley or wheel 8, to the shaft of which are secured the driving crank-arms 9, having the pins 10. To each crank-pin 10 is swiveled a pedal-support 11, having a pedal bearing-pin 12. To each crank-pin is also swiveled or jointed a link 13, jointed at 14 to a movable support or swinging arm or rod 15, jointed at 16 to any suitable part of the frame or to a bracket or part formed with or fixed to the frame. A second link 17 is jointed to the support or connection 15 at 18 or separately from the link 13 or its connectingpoint 14. At 19 said link 17 is jointed or connected to the pedal-support 11 or to an extension or horn 20, extending from such pedal-support.

The link 13, moving with support 15, maintains a constant distance between the crankpin 10 and the point 14 of support 15, and the link 17, moving with support 15, maintains a constant distance between the joint or connection 19 and thepoint 18 of support 15. The pedal 21, swiveling on pin 12, receives the pressure of the foot, as known.

The pedal-support 11, by being formed bail or U shape, will enable proper bearing to be obtained for the pins 10 and 12. Said support 11, with its horn or projection 20, being formed or made of metal or suitable material Serial No. 653,750. (No model.)

and of suitable shape, will be strong and durable. The link 17, maintaining a constant distance between points 18 and 19, serves as a holding or adjusting means for keeping the pedal-support at a practically constant inclination or position or in such position as to maintain pedal 21 within easy reach of or in proper position for the foot during the revolution of the crank. The pedal-support 11 and link 13, as seen, are commonly pinned to the crank or pin 10, and the pedal-support follows or partakes of the circular motion of this crank. A sleeve 22, Fig. 4, rotary on pin 10, can be made to give an easy support for the pedal-carrier 11; but this sleeve is not absolutely necessary.

The link 17 instead of connecting with the pedal-support at point 19 might connect with such support at another point, as pedal-pin 12. The inclination or adjustment of the pedal-support can be regulated by lengthening or shortening link 17, as required by the seat or position of the rider, for giving e1fect ive stroke or pressure. When the crankarms 9 are in vertical position, it is noticed that the pedal-pins 12 or their pedals are ahead of the sprocket-wheel 301* of its center or axle. During the revolution of the crankarm the pedals, lying in front of the crankpins 10, are in convenient reach or in effective position both for forward motion and for backpedaling to effect braking.

The pins or pivots 16 are shown in Fig. 3 as separate; but one common pin 16 for both supports 15 can be extended from side to side of the machine, such common pin serving to brace or stiffen the frame.

In case the vehicle is to be converted into the former style or to be used without this crankmotion the parts 15, 13, 17, and 9 can be readily dismounted and the old-style crankarms with pedals applied, as heretofore. Oldstyle machines can be readily supplied with this attachment.

The pedal-support 11 being held in advance of or so as to form an extension of the crankarms 9 during the downstroke of such arm, increased leverage or efficient action can be obtained by the downward pressure of the foot propelling the vehicle. Such pedal being held in advance of the crank-arm 9 when the latter is in vertical up or down position, as

seen by the two crank-arms 9 in Fig, 2, enables the crank to be forced past the deadcenter.

In starting it is customary to place a crankarm vertically upward, Fig. 5. In this position the forward ends of links 13 and 17 are nearest together, and an extension 13 of link 13, provided with set-screw 23, can be made to support the pedal-carrier and will take 01f from link 17 the excessive strain caused by the rider vaulting into place. This screw 23 can of course be omitted. As the crank-arm 9 leaves the position shown in Fig. 5 the links 13 and 1? gap or spread, so that screw 23 passes out of contact with pedal-support 11.

What I claim as new, and desire to secure by Letters Patent, is-

1. In combination with a drivingcrank, a pedal-support loosely connected at one end to said crank, a pedal carried by the support, a pair of adjusting-links for holding the pedal out of alinement with the crank-axis, one of said links being connected to the crank, and the other connected to the pedal-support and aswinging arm to which both of the saidlinks are loosely connected.

2. In combination with a driving-crank, a pedal-support loosely connected to said crank and having a rearward extension at one end, a pedal carried by said support intermediate its ends, a swinging arm, and a pair of links each jointed at one end to the swinging arm and having their opposite ends jointed to the pedal-support extension and crank respectively, in such manner as to support the pedal out of alinement with the crank-axis, substantially as described.

In combination witha driving-crank having a crank-pin, and a sleeve loosely jour naled on said pin, a pedal-support connected to said sleeve, a pedal carried by the support, a swinging arm, and a pair of links each separately jointed at one end to the swinging arm and having their opposite ends jointed to the pedal-support and crank respectively in such manner as to support the pedal out of alinement with the crank-axis, substantially as described.

4. In combination with a driving-crank, a pedal-support loosely connected to said crank and a pedal carried by said support, aswingin g arm, and a pair of links each separately jointed at one end to the swinging arm and having their opposite ends jointed to the pedal-support and crank respectively in such manner as to support the pedal out of alinement with the crank-axis, substantially as described.

5. In combination with a driving-crank, a pedal-support loosely connected to said crank, a pedal carried by said support, a swinging arm, a pair of links each jointed at one end to the swinging arm and having their oppo-' site ends jointed to the crank and pedal-support respectively, an extension on one of said links, and a set-screw carried by said extension, said screw being arranged to support the pedal when the crank is in its highest position, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

PHILIPP GOLDMANN.

Witnesses:

WM. 0. HAUFF, E. F. KASTENHUBER. 

